July 2013 3.8 Supply voltages in the HSCI system 239
General
information
The two 24 V output voltages of the PSL 13x are generated by two separate
power supplies. The + 24 V NC and + 24 V PLC voltages are separated from
each other by basic insulation and fulfill the requirements of EN 61800-5-1 for
low voltage electrical separation.
The 0 V line of the NC supply voltage must be connected separately to the
central grounding point of the machine (= central functional ground). The 0 V
NC voltage in the PSL 130 is therefore connected internally with the outward
conductor to signal ground (= central functional ground). An outward
connector to protective ground will not be available for the 0 V PLC voltage
until variant 03. With the variants up to and including variant 02, the 0 V PLC
must be tapped at terminal X90.4 and led to the central protective ground. In
variant 03 and later variants, an outward connector at the PSL will be available
for connecting the 0 V PLC voltage, too.
With the PSL 135, the connections to the central functional ground and
protective ground must be realized over the 0 V connections. The respective
outward connections will not be available until the next hardware variants of
the PSL 135.
The +24 V PLC voltage is also electrically separated by the power supply unit.
However, because of the connection to the PLC part of the HSCI system this
is a supply voltage with basic insulation. This voltage must not be linked with
other voltages.
The +5 V NC supply voltage for X74 of the PSL 135 is taken from the +24 V
NC supply voltage and is therefore galvanically connected with it.
For the entire HSCI system, the +24 V NC power supply voltage is
required to be safely separated voltage and must not be connected with
the +24 V PLC voltage of the system.
Protective Extra Low Voltage (PELV) according to EN 61800-5-1 must be
complied with for the +24 V NC power supply of the machine.
The 0 V signal of the PLC power supply must be connected by a 6 mm
2
conductor to the machine's central protective ground (PE).
Refer to your control's grounding diagram!
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